Eriksen, 27, penned a contract through June 2024 with the Serie A challengers. Reports suggest Inter have splashed £16.9 million for the player whose deal with Spurs was set to expire this summer.
Since Eriksen's Premier League debut following a move from Ajax in 2013, the creative midfielder has recorded the most assists, goals from outside the box, and chances created over that spell.
Eriksen twice won Spurs Player of the Year in 2013-14 and 2016-17. His departure means Erik Lamela is the last of the seven players signed with the then-world-record £85 million accrued in 2013 for Gareth Bale's move to Real Madrid.
"I couldn’t wait to join, it’s wonderful to be here and I’m happy to be a new Inter player," Eriksen said. "I’m very excited and can’t wait to introduce myself to the fans. I’ve already experienced their warmth, it’s been a fantastic welcome. I feel great."
The Dane's acquisition marks the latest transplant from England's top flight under Antonio Conte's watch at Inter. Romelu Lukaku and Alexis Sanchez made the switch from Manchester United in the summer, and fellow former Red Devils regular Ashley Young joined the Nerazurri earlier in the January window.
Eriksen, who will reportedly pocket £170,000 per week in wages with the 18-time Italian champions, will sport No. 24 ahead of a potential debut against Udinese on Sunday.